Membrane Switch Circuit Film Thickness Selection

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Membrane Switch Circuit Film Thickness Selection

Membrane switch is an operating system that integrates key functions, indicating components, and instrument panels. It is composed of four parts: panel, upper circuit, isolation layer and lower circuit. Press the membrane switch, the contact of the upper circuit is deformed downward, and it is in contact with the plate of the lower circuit. After the finger is released, the contact of the upper circuit bounces back, the circuit is disconnected, and the circuit triggers a signal. Membrane switch structure is rigorous, beautiful appearance, good sealing. It has the characteristics of moisture-proof and long service life. Widely used in electronic communications, electronic measurement instruments, industrial control, medical equipment, automotive industry, smart toys, household appliances and other fields.


The film of the circuit layer in the membrane switch, considering the separation and rebound of the switch electric shock and the reliability of the lead to the connector or riveting, so the thickness of the circuit material should be selected between 0.125mm and 0.15mm. If it is too thin, there will be no resilience, the separation of the contacts will not be agile, too thick, the action will be slow, and the operation will be increased. From the specific situation, the choice of film thickness is also related to the following factors:

1. The thickness of the isolation layer.

2. The shape of the key body.

3, the size of the key body.

Therefore, it is appropriate to select the material of the thin film switch circuit layer with a thickness of 0.125mm.

Keywords: membrane switch, membrane panel, touch screen